KATRITZKY A. R.; CUTLER A. T.; DENNIS N.; RAHIMI-RASIGOO S.; SABONGI G. J+, Z. CHEM., 1979, 19, NO 1, 20-21
作者:KATRITZKY A. R.、 CUTLER A. T.、 DENNIS N.、 RAHIMI-RASIGOO S.、 SABONGI G. J+
DOI:——
日期:——
1,3-Dipolar character of six-membered aromatic rings. Part 51. Cycloadditions of 1-(β-benzoylvinyl)-3-oxidopyridiniums and subsequent transformations
作者:Alan R. Katritzky、Soheila Rahimi-Rastgoo、Gebran J. Sabongi、Gerhard W. Fischer
DOI:10.1039/p19800000362
日期:——
β-p-Chloro-, β-p-bromo-, and β-2-chloro-5-nitrobenzoyl-vinyl chloride react with 3-hydroxypyridine to give quaternary salts which with base give the corresponding betaines. These betaines undergo thermal dimerisation and cycloadditions with mono- and di-enes at the 2,6- and 2,4-positions, respectively. The site-, regio-, and stereo-selectivity of these cycloadditions are discussed with reference to